/Engine/Source/Runtime/RenderCore/Public/VirtualTexturing.h
Gives a localized mip bias for the given local vAddress. This is used to implement sparse VTs, the bias is number of mip levels to add to reach a resident page Must be thread-safe, may be called from any thread
Mip bias to be added to vLevel to reach a resident page at the given address
virtual uint32 GetLocalMipBias ( uint8 vLevel, uint32 vAddress ) const